The updated version of the shematic & pcb using a correct Pico footprint is available at the following url https://123d.circuits.io/circuits/2182347-espruino-pico-usb-host-sd-shim
Also, I wonder what'd be the best way to position the micro SD slot while still allowing access to the LEDs, the button, as well as the back side of the Pico .. any hint / fork is welcome ;)
There's also the question of MAX_GPIN's & MAX_GPOUT's as well as the unused pins of the Pico
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